/diy/ - Do It Yourself

Does anyone have any advice on using a circular saw? My career is in programming and I am terrified of having an accident with the circular saw even though I have seen people in the construction field use this thing so recklessly without care. I have a Ryobi circular saw that I got in a Black Friday tool kit promotion (it came with a jigsaw, sawzall, impact driver, drill, and an oscillating tool). I actually used the jigsaw and oscillating tool along with a hacksaw to cut some plywood to repair some flooring but it was a pain in the ass and the cuts weren't good. I figured I need to learn how to use this damn circular saw if I actually wanna be productive and start getting shit done around the house (I live in an old mobile home that needs new subfloor so I'll be cutting a lot of plywood).